Interesting looking app note from Microchip on optimising battery life when using their MCP1640 DC Boost Converter chips. I haven't investigated these chips but from the table of features on the first page it looks like they can do some interesting things to help conserve battery life. http://ww1.microchip.com/downloads/en/AppNotes/01337A.pdf --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .